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Magnetism and Matter
Question
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Electromagnets are made of soft iron because soft iron has

  • low retenitivity and high coercive force

  • high retentivity and high coercive force

  • low retentivity and low coercive force

  • high retentivity and low coercive force

Answer

A.

low retenitivity and high coercive force

The material suitable for making electromagnets should high retentivity and low coercivity

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Some More Questions From Magnetism and Matter Chapter

Answer the following question:
The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Answer the following question:
The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past?

Answer the following question:
The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

A bar magnet of magnetic moment 1.5 JT–1 lies aligned with the direction of a uniform magnetic field of 0.22 T.
(a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction?
(b)    What is the torque on the magnet in cases (i) and (ii)?